Chris is a former director general of Cern and was instrumental in creating the Large Hadron Collider. He's now chair of the council of SESAME (Synchrotron-light for Experimental Science and Applications in the Middle East).

Chris updates us on progress in the field of nuclear fusion, and reveals some fascinating details about his time at Cern.

"A bunch of geeks get together in the same physical space to collaborate and create awesome things, usually by mashing up APIs. A Hack Day is usually 48 hours long and involves a sleepover ...although not much sleeping happens when everyone is either hacking or playing Werewolf."